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    Subject[PATCH V2 1/2] sched/debug: Inform the number of rt/dl task that can migrate
    Date
    Add the value of the rt_rq.rt_nr_migratory and dl_rq.dl_nr_migratory
    to the sched_debug output, for instance:

    rt_rq[0]:
    .rt_nr_running : 2
    .rt_nr_migratory : 1 <--- Like this
    .rt_throttled : 0
    .rt_time : 828.645877
    .rt_runtime : 1000.000000

    This is useful to debug problems related to the dl/rt schedulers.

    This also fixes the format of some variables, that were unsigned, rather
    than signed.

    Signed-off-by: Daniel Bristot de Oliveira <bristot@redhat.com>
    Cc: Luis Claudio R. Goncalves <lgoncalv@redhat.com>
    Cc: Clark Williams <williams@redhat.com>
    Cc: Luiz Capitulino <lcapitulino@redhat.com>
    Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Steven Rostedt <rostedt@goodmis.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Ingo Molnar <mingo@kernel.org>
    Cc: LKML <linux-kernel@vger.kernel.org>
    Cc: linux-rt-users <linux-rt-users@vger.kernel.org>
    ---
    kernel/sched/debug.c | 17 +++++++++++++++--
    1 file changed, 15 insertions(+), 2 deletions(-)

    diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
    index 0e2af53..287615a 100644
    --- a/kernel/sched/debug.c
    +++ b/kernel/sched/debug.c
    @@ -552,15 +552,21 @@ void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)

    #define P(x) \
    SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rt_rq->x))
    +#define PU(x) \
    + SEQ_printf(m, " .%-30s: %lu\n", #x, (unsigned long)(rt_rq->x))
    #define PN(x) \
    SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rt_rq->x))

    - P(rt_nr_running);
    + PU(rt_nr_running);
    +#ifdef CONFIG_SMP
    + PU(rt_nr_migratory);
    +#endif
    P(rt_throttled);
    PN(rt_time);
    PN(rt_runtime);

    #undef PN
    +#undef PU
    #undef P
    }

    @@ -569,14 +575,21 @@ void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq)
    struct dl_bw *dl_bw;

    SEQ_printf(m, "\ndl_rq[%d]:\n", cpu);
    - SEQ_printf(m, " .%-30s: %ld\n", "dl_nr_running", dl_rq->dl_nr_running);
    +
    +#define PU(x) \
    + SEQ_printf(m, " .%-30s: %lu\n", #x, (unsigned long)(dl_rq->x))
    +
    + PU(dl_nr_running);
    #ifdef CONFIG_SMP
    + PU(dl_nr_migratory);
    dl_bw = &cpu_rq(cpu)->rd->dl_bw;
    #else
    dl_bw = &dl_rq->dl_bw;
    #endif
    SEQ_printf(m, " .%-30s: %lld\n", "dl_bw->bw", dl_bw->bw);
    SEQ_printf(m, " .%-30s: %lld\n", "dl_bw->total_bw", dl_bw->total_bw);
    +
    +#undef PU
    }

    extern __read_mostly int sched_clock_running;
    --
    2.9.4
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